While I don't disagree with some of the pain you describe, you conveniently gloss over the fact that gnu developed a system that worked, and then made it free to everyone to consult and use.
BSD also did it. They did it better. Maybe more modern but AOSP also did it but at a different level of binary: instead of ELF, using compiled Java bytecode archives.
The root cause is alternative libc implementations. Are BSD syscalls considered stable? I remember Go moving to use libc on OpenBSD. Solaris also has the libc as the stable interface. Linux kernel is an outlier here guaranteeing stable syscalls but you wanting to use another libc is not Glibc's problem.
Except the other UNIX systems, starting with the original one, evolved from only having static linking to various ways to connect libraries and applications.
